UDFs callable as void functions

Changed in: 2.0

Description: In Firebird 2.0 and above, PSQL code may call UDFs without assigning the result value,
i.e. like a Pascal procedure or C void function. In most cases this is senseless, because
the main purpose of almost every UDF is to produce the result value. Some functions however
perform a specific task, and if you're not interested in the result value you can now spare
yourself the trouble of assigning it to a dummy variable.

Note

RDB$GET_CONTEXT and
RDB$SET_CONTEXT,
though classified in this guide under internal functions, are actually a kind of
auto-declared UDFs. You may therefore call them without catching the result. Of course this
only makes sense for RDB$SET_CONTEXT.